Collapsible plumb bob



FIG. 1 is a perspective view of a collapsible plumb bob showing my new design;

FIG. 2 is a front view thereof; and the rear view is a mirror image thereof;

FIG. 3 is a right side view thereof; and the left side view is a mirror image thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a collapsible plumb bob, as shown and described. 